The whitening of the front of the nail separating from the flesh may be caused by trauma, nail fungus disease, psoriasis, nail dystrophy and other diseases. 1. Trauma: heavy objects, crushing injuries, sharp object injuries and other factors may lead to nail and nail bed separation, cracks, deformities, whitening and other symptoms. 2. Nail fungal disease: commonly known as “gray nails”, is caused by dermatophytes, yeasts and molds invading the nail plate and/or subnail tissues, the nails can be cloudy, thickening, separation, discoloration, warping, surface unevenness and other symptoms, generally no self-conscious symptoms, the disease is contagious, more difficult to treat, high recurrence rate. 3. Psoriasis: it is a skin disease caused by the interaction of environmental factors, genetic factors, immune factors, etc. It is mainly manifested as erythematous skin spots or plaques, and some patients will have abnormal nails, turbid nail, nail peeling, nail hypertrophy, etc. At present, this disease can not be cured at all, but some patients can be clinically cured after active treatment. 4. Nail dystrophy: the cause of nail dystrophy is not yet clear, primary nail dystrophy may be related to heredity, secondary nail dystrophy may be related to certain systemic diseases, such as lichen planus, scleroderma and so on. Clinically, nail dystrophy can appear nail plate turbidity, roughness, nail peeling, thinning, thickening and other symptoms, often involving multiple nails. There are many diseases that cause the front of the nail to separate from the flesh and whitening, it is recommended that the patient go to the regular hospital in time for a clear diagnosis, and under the guidance of the doctor for symptomatic treatment.