A lot of small bumps at the fingernail cover may be related to fungal infection, psoriasis, nail dystrophy, periungual warts, nail lichen planus and other conditions. 1. Fungal infection: If fungal infection affects the nail cap area of the finger, it will lead to changes in the nails, such as the surface of the nails will appear uneven bumps, the nails become fragile, the nails become yellow and gray, the nails are broken, the nails are thickened and so on, and in severe cases, it may lead to the phenomenon of nail flesh separation. 2. Psoriasis: Patients with psoriasis usually have symptoms such as nail pitting, nail peeling and spatulate nail. 3. Nail malnutrition: If the nails are malnourished, it may cause the nails to lose luster, the surface of the nails is rough and uneven, and there are lumps and bumps when touching the nails. 4. Periungual warts: Hyperkeratosis, dome-shaped plaques or pimples may appear around the nails, and the surface is rough. 5. Nail lichen planus: the patient’s nails will be thickened, the surface of the nail will appear cracks or grooves, and there will be nail plate destruction phenomenon. Considering that many causes can lead to abnormal reaction of the nail cover, patients should consult a doctor in time and do systematic examination to clarify the cause.