why do toenails look bruised and thickening
When toenail thickening occurs in younger people it is most commonly due to infection or injury. If the thickening is caused by toenail fungus, the nail may turn a yellow or brown color before it begins to thicken. Fungal infections often have a foul odor, and may cause fluid to collect under the nail. Trauma, whether caused by he dropping of a hammer on the toe or by the imperceptible pressure of a shoe, can result in permanent thickening of the nail. 2  Systemic diseases such as psoriasis, eczema, rheumatoid arthritis, cardiovascular disease, and cancer, to name a few, may affect the toenails.