Skin problem portmanteau

• Side effect of steroid use
• Breakout that's behind you
• Spots that are hard to reach?

Wiktionary Word definitions in Wiktionary
n. (context informal English) acne on the back.

Wikipedia Word definitions in Wikipedia
Bačne (; in older sources also Bačna , ) is a small dispersed settlement in the hills south of the Poljane Sora Valley in the Municipality of Gorenja Vas–Poljane in the Upper Carniola region of Slovenia .