Detailed answer

Melasma and macular amyloidosis are two different skin conditions that can sometimes have similar appearances. Melasma is a common pigmentation disorder characterized by dark patches on the face, whereas macular amyloidosis is a skin disorder characterized by itchy and flat spots on the upper back. However, due to their similar pigmented appearance, there can be confusion in diagnosing these conditions. A detailed examination by a dermatologist, including a medical history evaluation and possibly even a skin biopsy, may be necessary to accurately differentiate between melasma and macular amyloidosis.