Red turned black on face. Area. help?

Whenever I ate somethin spicy area all around my lips ie. chin,area below nose in short area surrounding lips n not lips turned red..so consulted a skin specialist for it n was prescribed a gel named "Erythego Gel" n applied on affected area of face as prescribed(amount n way to apply). Used it js fr 2 days though the redness went off but now that area has turned dark brown kinda..my skin is sensitive n combination type,don't use makeup,use face wash(prescribed by doctor) named "gLOGEOUS Advanced face wash gel". I even have acne which leave acne marks on my face n don't hv habit of picking them so, consulted skin specialist for d same and ws prescribed two gels fr day tym "Nioclean Gel" n night namely "Femcinol-ADP Gel" . Tablet prescribed to me fr both problems ws "Aziclass-500"..nothing is working out..skin is becomin darkr n I don't go out in sun mch, excercise regulrly n don hv dandruff.All the abov mentioned vr prescribed by Skin Doctor n gels applied only on affected area.HELP