Heat can worsen or flare melasma so in theory a sauna could worsen melasma. Triggers are different for each individual so it is best to make an appointment with a board-certified dermatologist for further discussion and evaluation in the best treatment of melasma. Good luck!
This is a great question! Melasma can be a challenge to treat, because there are a variety of triggers that can make it worse. In general, almost all patients are sensitive to direct sun exposure and hormonal triggers (pregnancy, oral contraceptives, in-vitro fertilization). That said, we are learning more and more about new triggers for melasma. I find that some patients are sensitive to heat (as one would encounter in saunas), indirect sun-exposure (sun on the arms and hands triggering melasma despite good sun protection on the face), exercise, and even diet. It certainly is possible that you are sensitive to the heat from saunas, and that this may be making your melasma worse - it's impossible to say without examining you personally. I would recommend that you consult with a cosmetic dermatologist to discuss your concerns. Best of luck!
