Aloe,  Aloe vera, probably more aloe plants in America than televisions and cell phones.  First aid for scrapes, scratches, burns, cuts.  Gel is a good surfactant, a wound cleansing agent...(More)

Aloe gel may be scooped out of the leaf with a spoon or butter knife.  Cut skin off one side and scrape...See photo below right.
Aloe emodin, the white blotches, this chemical is a purgative. Transparent gel like interior of Aloe vera leaf, an excellent antiseptic wash for sunburn (cooling wetting agent, surfactant).