<unk>  is redness of the skin caused by capillary congestion.  
It can be caused by infection, massage, electrical treatments, acne medication, allergies, exercise or solar radiation (sunburn), and waxing and plucking of the hairs any of which can cause the capillaries to dilate, resulting in redness.<unk>  is a common side effect of radiotherapy treatment due to patient exposure to ionizing radiation.
Erythema
Mottling
Dry skin
Miosis
Skin tenderness
Scalp rash
Pigmented lesions
Myalgia