The common causes of redness on fingertips include physiological factors, onychomycosis, and liver palms. 1. Physiological factors: When the fingertip area is exposed to chemicals for a long time, or when it is rubbed or squeezed, the blood vessels under the skin of the fingertip will dilate, resulting in redness of the fingertip. 2. Nail groove inflammation: when the tip of the nail or the surrounding tissues on both sides of the nail due to bacterial infection, triggering inflammation, pus, will also appear fingertip redness, accompanied by swelling, pain phenomenon. 3. Liver palms: Liver palms are one of the typical manifestations of patients with chronic liver disease, which are mainly manifested as reddening of the fingertips as well as the skin between the pisiforms and pisiforms, and may also appear as red dots or plaques. Clinical patients appear fingertip redness, there may be contact dermatitis, ringworm caused by the patient should be timely consultation, clear diagnosis and treatment.