Little toe nail only a little bit may be genetic, psoriasis nail, nail fungus and other reasons. 1. Heredity: little toe nails only a little bit may be related to heredity, if the patient’s parents have only a little bit of little toe nails, the patient may have the same situation, do not need to deal with. 2. Psoriasis nail: it is a nail surface lesion caused by psoriasis invading the nail bed or nail matrix, patients may have symptoms such as nail peeling, cracking and thickening, which will lead to little toe nails only a little. Patients can use topical tretinoin econazole cream, urea ointment and other drugs as prescribed by the doctor for treatment, and at the same time need to treat psoriasis. 3. Onychomycosis: It is mainly caused by the skin fungus invading the nail plate and nail lesions, and the nails are shrunken by the fungus invasion. Patients can use topical ketoconazole ointment, terbinafine hydrochloride cream and other drugs according to medical advice.