Originally Posted by ralfp

The US FDA considers sunscreens (at least real ones) to be drugs, and thus, logically, exempt from the 100mL limit.

FDA's PDF slide show for dummies (see page 4)

Sunscreens, antiperspirants, dandruff shampoos, and fluoride toothpastes are all medicines as defined by the US Federal government. It is not within the TSA's purview to declare that such items are not medicines.