Itchy legs turn bruised when scratched.

Itching on the leg that turns bruised after scratching may be due to normal physiological factors, which can be relieved with warm compresses. However, it could also result from pathological conditions such as allergic purpura or eczema, requiring appropriate medication. Detailed analysis is as follows:

I. Physiological Factors

If there is itching in the leg and excessive scratching occurs, it may cause rupture of subcutaneous capillaries and bleeding, leading to localized bluish-purple discoloration of the skin. Timely application of a warm towel to the affected area can help improve blood circulation and alleviate discomfort.

II. Pathological Factors

1. Allergic Purpura

This is a relatively common type of allergic vasculitis seen in clinical practice. It can lead to neutrophil infiltration, and scratching the itchy area may damage the vascular intima, resulting in bruising and discoloration. Treatment should follow medical advice using medications such as ibuprofen sustained-release capsules, levocetirizine hydrochloride granules, and indomethacin enteric-coated tablets.

2. Eczema

Eczema is an inflammatory skin condition that may present with rashes and itching. Excessive scratching can cause minor subcutaneous bleeding, leading to the appearance of purplish bruises. Treatment should be guided by a physician using medications such as tacrolimus ointment, pimecrolimus cream, and loratadine tablets.

Besides the above-mentioned causes, this symptom could also be due to contact dermatitis, thromboangiitis obliterans, or systemic lupus erythematosus. If the leg becomes bruised easily after scratching accompanied by itching, prompt medical evaluation at a hospital is recommended for timely and proper treatment.