Are there different kinds of melasma? are there sub-categories of melasma or is it all considered the same no matter what?

Melasma types: Melasma is sometimes classified into 3 types. Epidermal (superficial), dermal (deep) and mixed. Epidermal melanoma responds readily to treatment, whereas dermal melanoma responds poorly. Mixed melanoma responds partially to treatment. Melasma is very challenging to treat. Combination treatment is often needed for best improvement. Daily sunscreen is a must. Maintenance treatment is needed for most.