After the nails on hands and feet fall off, the newly grown nails are uneven.

Under normal circumstances, uneven nail regrowth after the shedding of fingernails or toenails may be caused by malnutrition, nail trauma, paronychia, onychomycosis, psoriasis, or other conditions. Patients should promptly visit a qualified medical facility for diagnosis and appropriate treatment based on their specific condition. Detailed explanations are as follows:

1. Malnutrition

If daily diet is unbalanced, deficiencies in essential nutrients such as zinc, calcium, and protein may occur, leading to inadequate nutrition during nail regrowth, resulting in an uneven nail surface. It is recommended to maintain a diverse and balanced diet to support healthy nail growth.

2. Nail Trauma

When fingernails or toenails suffer external impact or injury, bruising or subungual hematoma may develop. In severe cases, damage to the nail bed may occur. During the healing process, granulation tissue proliferation might lead to irregular nail growth. If there are no additional symptoms such as inflammation, pain, redness, or swelling, special medication is usually unnecessary, as this is considered a normal physiological phenomenon.

3. Paronychia

Poor hygiene around the nails can lead to bacterial infection, causing paronychia, which manifests as redness, swelling, and pain around the nail. Severe cases may result in nail deformity and uneven nail growth. Patients may use medications such as ichthammol ointment, fusidic acid sodium ointment, or mupirocin ointment as directed by a physician.

4. Onychomycosis (Fungal Nail Infection)

Fungal infection of the nail can invade the nail bed, leading to uneven, thickened nails on fingers or toes. Under medical supervision, patients may use antifungal medications such as itraconazole capsules, terbinafine hydrochloride cream, or miconazole nitrate cream to improve symptoms.

5. Psoriasis

This condition is often associated with low immunity and factors such as long-term smoking or alcohol consumption. Inflammatory factors can stimulate local skin, leading to pitting of the nails, uneven nail surface, itching, and scaly skin lesions. Patients may also experience symptoms such as redness and itching. Treatment options under medical guidance include tacalcitol ointment, tazarotene gel, or Yinxueling ointment.

Patients should maintain regular daily routines, ensure adequate sleep, and avoid prolonged熬夜 (staying up late).