A 40-year-old housewife comes to you complaining of recurrent episodes of redness, swelling, and pain around her fingernails for two years. She was previously diagnosed with "grey nail" and treated with griseofulvin for six months, but the treatment was ineffective. The patient has mild diabetes mellitus and currently requires only dietary restrictions.
Physical examination Dry and crazed finger skin, lusterless, discolored, pigmented nail plate surface with irregular furrows. The proximal and lateral nail folds are erythematous, edematous, and mildly tender, and nail cuticles are absent. An image of the affected nail of the thumb is attached for your reference.
