(1) Early application of topical steroids is useful to limit erythema and pruritus.(2) The most common side effects are acne, erythema , and burning and stinging of the skin.(3) The only adverse effects of therapy were transient skin erythema and local hair loss in three irradiated patients.(4) For people with light skin, any erythema should be a signal for intervention and monitoring.(5) Local irritation, erythema , ulceration, and tenderness were common reactions.(6) On average, subjects received a UVR dose of 4.6% of the ambient daily erythemal UVR.(7) Clinical studies have shown no difference in the erythemal response to ultraviolet radiation between children and adults.(8) A depletion of the ozone column by 25% could increase the erythemal exposure of field scientists or indigenous arctic people by approximately 40% during the spring.(9) Seborrheic dermatitis causes scaly erythematous skin lesions most often found in nasolabial folds and eyebrow areas.(10) Infections such as mastitis and cellulitis tend to be erythematous , tender, and warm to the touch; they may be more circumscribed if an abscess has formed.(11) At 24 hours after irradiation, sites were visually assessed to determine the minimal erythemal dose, i.e. the lowest dose at which erythema was perceptible.(12) Psoriasis typically presents as erythematous plaques with thick, white scale on the elbows, knees, scalp, and lower lumbar area.(13) Thrush and erythematous candidiasis are common in patients with immune defects and are often an early manifestation of the immunodeficiency.(14) In the past, the term minimum erythemal dose was often used as a measure of the cumulative UVR (ultraviolet radiation) exposure required to induce erythema or sunburn in people.(15) The disease begins as an erythematous papule at the site of the sandfly bite on exposed parts of the body.