How can steroid creams thin skin?

Not correct: Steroid creams are usually weak formulation of steroids and with limited and intermittent use, it does not cause thinning of the skin. Steroid ointments are stronger steroids and with long use plus heavy application may lead to skin atrophy. Steroid use for eczema is extremely beneficial and actually prevents skin thickening.

Yes: Prolonged use should be avoided.

Thin Skin: Fragile or thin skin that tears easily is a common problem in older adults. Aging, sun exposure and genetics all play a role in thinning skin. Certain medications, such as long–term use of oral or topical corticosteroids, also can weaken skin and the blood vessels in the skin. http://www.mayoclinic.org/healthy-lifestyle/healthy-aging/expert-answers/thin-skin/faq-20057753