1.) Person: Maria, a 45-year-old woman, dealing with hair and nail problems.Health Concern: Maria has noticed a persistent, itchy rash on her hands and arms. Her nails have become brittle and are starting to separate from the nail bed. She's also experiencing increased hair loss.Possible Problems: These symptoms could indicate allergic contact dermatitis, a fungal nail infection (onychomycosis), and possibly a thyroid issue or nutritional deficiency contributing to the hair loss. Further investigation by a doctor is needed to confirm the diagnoses.2.) Person: David, a 60-year-old man, dealing with nail and skin problems.Health Concern: David has a new, irregularly shaped mole on his back that is larger than a pencil eraser and has changed color over the past few months. He also has thickened, discolored toenails.Possible Problems: The changing mole is a significant concern and needs immediate evaluation by a dermatologist to rule out melanoma, a type of skin cancer. The thickened, discolored toenails could be a sign of onychomycosis or, less commonly, psoriasis.