Photosensitive dermatitis is actually a common type of dermatitis. However, this kind of dermatitis is mainly caused by patients' allergic reactions to sunlight stimulation, especially to the ultraviolet rays in sunlight.

Therefore, patients may experience certain inflammation or other similar skin lesions on the exposed areas of their skin. Generally, it mainly manifests as erythema on the exposed skin, or papules and papulovesicles on the basis of erythema. In severe cases, blisters of varying degrees may occur, and if it progresses further, erosion may also appear. At first, patients may experience itching, but as the condition develops, some people may feel pain if the inflammation worsens.

So, if photosensitive dermatitis occurs, it is necessary to avoid sunlight immediately and then undergo anti - allergic treatment.