See Below: There are many potential causes of red spots on the penis, most of which are "not" STDs and "a picture is worth a thousand words." The STDs syphilis (painless ulcer) and herpes (tiny blisters) are usually self-limiting. Benign causes: balanitis (fungal); psoriasis, seborrheic dermatitis, lichen planus, contact/allergic dermatitis, fixed drug eruption. Pre-cancerous: Erythroplasia of Queyrat.
Answered 10/15/2017
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