Familiarity with common dermatologic conditions affecting the male genitalia is essential for timely recognition and appropriate management. This list details ten of the most frequently encountered rashes and lesions.
1. Genital Herpes (HSV)
Genital herpes is a common sexually transmitted infection (STI) caused by the herpes simplex virus (HSV), usually HSV-2, though HSV-1 cases are increasing.
Feature | Description |
|---|
Appearance | Small, painful, grouped vesicles (blisters) on an erythematous (red) base. These soon erode to form shallow ulcers. |
Location | Glans, prepuce (foreskin), shaft, or surrounding skin. |
Symptoms | Pain, burning, itching, dysuria (painful urination), and systemic symptoms like fever and malaise during the first outbreak. Recurrences are often milder. |
Cause | Herpes simplex virus (HSV-1 or HSV-2). |
2. Genital Warts (Condylomata Acuminata)
These are benign skin growths caused by the Human Papillomavirus (HPV).
Feature | Description |
|---|
Appearance | Skin-colored to pink/red soft papules or nodules with a characteristic 'cauliflower-like' or verrucous (warty) surface. |
Location | Anywhere on the genitals, perineum, or perianal area. |
Symptoms | Often asymptomatic, but can be associated with mild itching or burning. |
Cause | Human Papillomavirus (HPV), typically low-risk types (e.g., 6 and 11). |
3. Syphilis (Primary Chancre)
Primary syphilis presents as a chancre, a highly infectious lesion that is often painless.
Feature | Description |
|---|
Appearance | A single, firm, painless, clean-based ulcer with raised, indurated (hardened) borders. |
Location | Site of inoculation (usually glans, coronal sulcus, or shaft). |
Symptoms | Usually asymptomatic locally; associated with painless regional lymphadenopathy (swollen lymph nodes). |
Cause | Treponema pallidum (a spirochete bacterium). |
4. Candidiasis (Thrush)
Genital candidiasis is a fungal infection caused by Candida albicans, often seen in uncircumcised males, especially those with diabetes, poor hygiene, or recent antibiotic use.
Feature | Description |
|---|
Appearance | Bright red, shiny patches (balanitis) under the foreskin or on the glans, often with satellite pustules or superficial white plaques. |
Location | Glans and inner prepuce. |
Symptoms | Intense itching, burning, soreness, and sometimes a thick, white discharge. |
Cause | Candida albicans (a yeast/fungus). |
An inflammatory skin reaction due to contact with an irritant or allergen.
Feature | Description |
|---|
Appearance | Erythema, scaling, vesicles, papules, and sometimes edema (swelling). |
Location | Area of contact (e.g., from soap, laundry detergent, latex condoms, or spermicide). |
Symptoms | Intense itching, burning, and soreness. |
Cause | Irritant or allergic reaction. |
6. Psoriasis
Chronic inflammatory skin condition that can affect any part of the body, including the genitals.
Feature | Description |
|---|
Appearance | Bright red, well-demarcated plaques without the typical thick silvery scale seen elsewhere (due to moisture). |
Location | Glans, shaft, or groin folds (inverse psoriasis). |
Symptoms | Mild itching or burning. |
Cause | Autoimmune/genetic. |
7. Lichen Planus
An inflammatory condition that can affect the skin, hair, nails, and mucous membranes.
Feature | Description |
|---|
Appearance | Small, purple, polygonal, pruritic (itchy) papules on the skin. On the glans, they may appear as annular (ring-shaped) lesions. |
Location | Glans, shaft. |
Symptoms | Itching, sometimes painful erosions in the mouth (oral lichen planus may coexist). |
Cause | Autoimmune/inflammatory. |
8. Pearly Penile Papules (PPP)
These are small, benign, flesh-colored bumps that are normal anatomical variants.
Feature | Description |
|---|
Appearance | Small, dome-shaped or filiform (thread-like) papules arranged in one or more rows. |
Location | Coronal margin of the glans (base of the head of the penis). |
Symptoms | Asymptomatic (no symptoms). |
Cause | Normal physiological variant; not an STI. |
9. Molluscum Contagiosum
A viral skin infection causing firm, dome-shaped papules.
Feature | Description |
|---|
Appearance | Multiple small, firm, flesh-colored to pink papules with a central umbilication (dent). |
Location | Genitals, groin, thighs, and abdomen. |
Symptoms | Usually asymptomatic, sometimes mild itching. |
Cause | Poxvirus. |
10. Angiokeratomas of Fordyce
Benign, dark-red to purple spots that are dilated superficial blood vessels.
Feature | Description |
|---|
Appearance | Multiple small, dark-red, purple, or black papules that blanch poorly when pressed. |
Location | Scrotum, sometimes on the penile shaft. |
Symptoms | Asymptomatic, but can sometimes bleed if scratched. |
Cause | Dilated blood vessels; not an STI. |
