The most common nail disorder is yeast or fungal infections.  These can be treated homeopathically or with antifungal antibiotics.  

Psoriasis can also affect the nails and is sometimes difficult to distinguish from a fungal infection.

Skin cancer and melanoma can also affect the nail, usually involving just one nail.  Treatment for skin cancer and melanoma is with surgical biopsy and excision.

A consultation is required to diagnose and treat any nail condition.