###Human: Skin of penis is peeling a day after sex. Can it be yeast infection or STD? ###Assistant: Hello. The peeling of skin after sexual intercourse occurs in 3 to 5 % of men. The most common cause is allergic (contact dermatitis), followed by fungal infection and STD like chlamydia or gonococcal infection. However, STD is associated with pain and dysuria. The other two are possible causes in your case. For more information consult a general medicine physician online -->