Does a male who is not in Nikkah can perform hijama?
I assumed that by “not in nikah” you mean “unmarried” and I understood through further questioning that by “perform” you mean he is the one undergoing hijama, not performing it. (In both cases gender is irrelevant as long as it is understood that a male performs (is performed on) on (by) males and a female on (by) females.) The actual question turns out to be: “An unmarried 15-year-old male is asking to undergo hijama, is it allowed according to Tariqa?” The answer is, let him fast instead.
Hajj Gibril Haddad