Hair is an extension of our integumentary system, or skin. Therefore, skin disorders can have a big impact on our hair health. Skin conditions that can cause hair thinning include:
Lichen planus - An inappropriate response of your immune system causes swelling and irritation on your skin, hair, and nails. On the skin, lichen planus looks like purple bumps that can become itchy. Hair loss is a common symptom of this condition. Generally, lichen planus resolves on its own, but it can cause issues when it affects mucous membranes like your mouth.
Tinea capitus - Commonly called ringworm, this fungal condition often starts with a small pimple and grows in size. When it happens on your scalp, the fungus can enter your hair follicles, causing them to break off and form bald patches. Ringworm can be quite itchy, but an antifungal medication can effectively treat this conditon.
Seborrheic dermatitis - This common skin disorder involves flaking on the scalp, likely due to an over-accumulation of oil. Malassezia, a fungus that can grow on the scalp, may also affect the oil glands, which can worsen flaking. Due to frequent itching and inflammation, you can notice hair thinning around infected areas.