STDs and Skin Health: Scabies, HPV and More

The skin is the body’s largest organ, and several STDs affect it in ways that go beyond the genital area. HPV, scabies, herpes, syphilis, and molluscum contagiosum all have significant cutaneous manifestations — some of which can appear anywhere on the body and some of which are the primary or only sign of an underlying infection.

• HPV causes genital warts and, in some cases, changes in skin cells that can lead to cancer

• Scabies is a skin condition transmitted primarily through close contact and sexual activity

• Secondary syphilis produces a distinctive rash on the palms and soles that can be the first noticed sign of infection

• Herpes causes recurring blistering skin lesions that can affect the face, genitals, buttocks, and in some cases other areas

• HIV-related immune suppression triggers a wide range of opportunistic skin conditions

HPV and Skin Health

Human papillomavirus is the most common STD-related skin pathogen. It causes genital warts — flesh-coloured, sometimes cauliflower-textured growths on the genitals, anus, inner thighs, or vulva — through low-risk strains (primarily types 6 and 11). High-risk strains (types 16 and 18) do not cause warts but produce microscopic changes in cervical, anal, penile, and vulvar skin that can progress to cancer if not detected and treated through screening. Bowenoid papulosis — flat, pigmented plaques on the genitals associated with high-risk HPV strains — is a specific dermatological presentation that warrants medical evaluation. HPV vaccination (Gardasil 9) prevents infection with the strains responsible for most warts and cancers.

Scabies

Scabies is caused by the mite Sarcoptes scabiei burrowing under the skin. It is transmitted through prolonged skin-to-skin contact — most commonly through sexual contact in adults, though also through household contact. The primary symptom is intense itching, especially at night, as the immune system reacts to mite proteins. The rash appears as small, raised bumps or blisters, typically in the skin folds between fingers, on the wrists, around the waist and buttocks, and in the genital area. In people who are immunocompromised, crusted (Norwegian) scabies can develop, with extensive skin involvement and extremely high mite counts.

Treatment requires prescription-strength permethrin cream or oral ivermectin, applied to the entire body from the neck down. All household members and recent sexual contacts should be treated simultaneously to prevent re-infestation. Bedding, clothing, and towels should be washed at 60°C or sealed in bags for 72 hours. Itching may persist for 2–3 weeks after successful treatment as a residual immune reaction — this does not mean treatment has failed.

Syphilis and the Skin

Syphilis produces characteristic skin manifestations at different stages. Primary syphilis: the chancre — a firm, painless ulcer at the site of infection, often on the genitals, anus, or lips. Secondary syphilis: the classic syphilis rash — rough, reddish-brown spots on the palms of the hands and soles of the feet, often accompanied by flat or raised patches on the trunk and face. These manifestations resolve without treatment but signal active systemic infection. In late syphilis, gummas — soft, tumour-like lesions — can cause deep ulceration in skin and underlying tissue.

Herpes and Skin Manifestations

Herpes simplex virus (both HSV-1 and HSV-2) causes blistering skin and mucosal lesions that recur throughout life. Primary outbreaks are typically the most severe: clusters of fluid-filled blisters that rupture and form painful ulcers before crusting over. Recurrent episodes are usually milder. Herpes can appear in the genital area, on the buttocks and thighs, around the mouth and lips, and — in cases of ocular herpes — on the cornea. People with immunosuppression (including HIV) can experience extensive, persistent, or atypically located herpes lesions. Suppressive antiviral therapy reduces outbreak frequency and severity.

HIV and the Skin

HIV-related immune suppression produces a wide range of dermatological complications. In early HIV, seborrhoeic dermatitis — a red, scaly rash affecting the face and scalp — is one of the most common skin manifestations. Eosinophilic folliculitis causes intensely itchy papules and pustules. Kaposi’s sarcoma produces distinctive violet or brownish skin lesions. Molluscum contagiosum, normally mild and self-limiting, can become extensive and disfiguring. Psoriasis, lichen planus, and drug reactions from antiretroviral medications all contribute to a high burden of skin problems in people with HIV. Effective antiretroviral therapy that maintains immune function significantly reduces the frequency and severity of most HIV-related skin conditions.

Molluscum Contagiosum

Caused by a poxvirus, molluscum contagiosum produces small, round, flesh-coloured bumps with a characteristic central dimple. In adults it is frequently sexually transmitted, appearing on the genitals, inner thighs, and lower abdomen. It can also spread through skin contact and shared towels in non-sexual settings. Most cases in healthy adults resolve spontaneously within 6–18 months, but treatment with cryotherapy, curettage, or topical agents can accelerate resolution. The condition is transmissible throughout the active infection period.

Tips for Skin Health and STD Prevention

• Get vaccinated against HPV — it is the most effective intervention for preventing HPV-related skin and mucosal conditions.

• Do not share towels, bedding, or clothing with someone who has scabies or molluscum — both can transmit through shared fabrics.

• Attend for any unexplained skin change in or near the genital area — do not assume it is nothing without clinical assessment.

• Complete scabies treatment fully and treat all household contacts simultaneously to prevent re-infestation.

• Use suppressive antiviral therapy if you have herpes and experience frequent outbreaks — it reduces outbreak frequency and transmission risk.

Frequently Asked Questions

Can STDs cause permanent skin damage?

In some cases, yes. Late-stage syphilis gummas can cause deep scarring. Extensive HPV-related precancerous changes, if not treated, can progress to cancer. Severe or recurrent herpes in immunocompromised people can cause persistent ulceration. Kaposi’s sarcoma in HIV leaves permanent skin changes. Early treatment of all these conditions prevents the most serious outcomes.

Can scabies affect the face?

In most adults, scabies does not affect the head or face — the mites prefer the folds and creases of the body. In infants and in immunocompromised adults with crusted scabies, the face and scalp can be involved. Standard permethrin treatment is applied from the neck down in most adults; treatment of the face and scalp is only needed in specific cases.

Is molluscum contagiosum an STD?

In adults, it is frequently sexually transmitted, but the virus has multiple transmission routes including skin-to-skin contact in non-sexual contexts, shared equipment and towels, and autoinoculation. Classifying it strictly as an STD understates its non-sexual transmission routes; it is perhaps most accurately described as an infection that can be sexually transmitted among other routes.

Can HPV warts be permanently removed?

Warts can be removed through cryotherapy, trichloroacetic acid, electrosurgery, or laser treatment. However, the underlying HPV virus may persist in the surrounding tissue and warts can recur. The immune system often eventually clears the virus, after which recurrence becomes less likely. Some people require multiple treatment cycles.

Does effective HIV treatment reverse skin conditions?

Many HIV-related skin conditions improve significantly or resolve with effective antiretroviral therapy that restores immune function. Seborrhoeic dermatitis, eosinophilic folliculitis, and molluscum contagiosum often improve substantially. Kaposi’s sarcoma can regress on ART. Some conditions require specific dermatological treatment in addition to ART.

Get Tested Today

Skin changes in or near the genital area should not be ignored. If you have any unexplained rash, sore, bump, or skin change and have been sexually active, getting tested is the right step. Fast, confidential testing is available at sexual health clinics and online.

Related reading: What Does an STD Rash Look Like? · STDs and Chronic Skin Conditions · Syphilis: Early Symptoms · Rare STDs You’ve Never Heard Of