Which skin condition involves white splotches caused by melanin inhibition?

The skin condition characterized by white splotches resulting from melanin inhibition is vitiligo. This condition occurs when the melanocytes, cells responsible for producing melanin, are damaged or destroyed, leading to depigmented areas on the skin. Vitiligo can manifest as patches in various sizes and shapes and is often more noticeable on darker skin.

In contrast, tinea versicolor, caused by a fungal infection, can result in lighter or darker patches on the skin, but these are due to the effect of the fungus on the skin's pigment rather than inhibition of melanin production itself. Psoriasis is an autoimmune condition that presents with red, scaly plaques due to rapid skin cell turnover and inflammation, not white splotches caused by melanin issues. Rosacea is primarily characterized by redness and visible blood vessels on the face, and it does not produce the white splotches associated with melanin loss.

Understanding the specific mechanisms behind each condition helps in distinguishing between them, making it clear why vitiligo is the correct answer when identifying skin conditions linked to melanin inhibition.