boyfriend scratching a wound on private part?

Welcome to e health forum.

Without a clear examination, it is very difficult to pinpoint the actual issue here.

But the area of involvement extending from the penis, scrotum, the perineal area upto the anus, along with itching can be due to conditions like eczema, fungal infections (Tinea Cruris).

Tinea cruris also called Jock itch, is a fungal infection of the groin area. The fungus thrives in warm moist areas, and can be triggered by friction from clothes and prolonged wetness in the groin area. The condition presents with itching and red raised, scary patches in the affected area.

The condition can be treated with topical medications containing miconazole or clotrimazole.

Other conditions that can present with itching in the groin can include lichen simplex chronicus, pubic lice, chemical irritation, etc.

Hence your boyfriend should consult with his doctor, at the earliest for a physical examination and proper advice.

I hope this helps.