Thyroid disease is more than a matter of weight gain or fatigue—it often manifests visibly through changes in your skin, hair, and nails. While the thyroid gland resides deep in your neck, ...

Both hypothyroidism and hyperthyroidism can cause skin changes associated with itchiness. These include dryness and patches of thick, scaly, discolored skin. Thyroid conditions can also cause an ...

A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed. It can be a normal color variation, especially in people with darker skin ...

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 ...