Detailed answer

There are similarities between melasma and progressive macular hypomelanosis (PMH) which may lead to misdiagnosis. Both conditions present as patches of lighter skin, commonly on the face. However, there are distinct differences. Melasma tends to have a more irregular border, and the patches are often larger and have different hues due to increased melanin production. On the other hand, PMH usually appears as smaller, round or oval-shaped, well-defined patches with smoother skin texture. It is important to consult with a dermatologist or skincare professional for accurate diagnosis and appropriate treatment options for each condition.