Medically reviewed by William Truswell, MD Key Takeaways Petechiae are tiny red or purple dots that don't turn white when you press on them.Petechiae can be caused by infections, certain medications, ...

An expert explains how to tell the difference between a spot that's probably harmless versus something you should get checked ...

Viral skin rashes (also known as viral exanthems) can cause itching, irritation, and pain — and possibly symptoms like fever or fatigue. Unlike allergic rashes, which happen when your immune system ...

There are two types of skin pigmentation disorders: hyperpigmentation, in which the skin produces too much melanin, and hypopigmentation, in which the skin produces too little melanin. Skin ...

That mysterious dark spot on your arm. The raised bump that appeared overnight. The cluster of tiny dots near your shoulder. When new marks appear on your skin, it’s natural to feel concerned about ...

Vitamin B12 deficiency often presents as changes in the skin such as paleness and hyperpigmentation, so what are its causes ...

Dark spots, stubborn patches, uneven tone — hyperpigmentation shows up in many ways and for just as many reasons. If you’ve ever wondered why some areas of your skin seem to darken out of nowhere (or ...