No, harsh lightening treatments can damage the skin, cause spots and are often prohibited; it is better to use gentle “evening” ingredients (niacin, azelaic acid, vitamin C) and target spots locally.

(Cameroon has even banned the importation of certain lightening products because of their harmful effects)

Opt for gentle cleansers, non-comedogenic moisturizers, lightweight serums, and a light cream at night; avoid heavy, oily formulas in hot, humid climates.

Yes for mild forms with a routine (gentle cleansing, sebum regulators, topical treatment, hydration), but consult a dermatologist if it lasts > 3 months, moderate to severe form or with scars.

(Local sources discuss dermato-cosmetic treatments depending on the severity)

You have to be careful: alternate treatments, introduce only one active ingredient at a time, use sun protection and observe your skin's reaction to avoid irritation or sensitivity.