The appearance of a thinner, more prominent-looking thumb in older adults is typically driven by a combination of muscle loss and skin changes:
: Some individuals may have naturally longer or thinner thumbs due to conditions like triphalangeal thumb (where the thumb has three bones instead of two) or connective tissue disorders like Marfan syndrome , which causes long, slender digits. mature skinny thumb
: Regular use of creams helps "plump up" the skin temporarily and protects the skin barrier from drying agents like harsh detergents. The appearance of a thinner, more prominent-looking thumb