Alkali metals: Li, Na, K, Rb, Cs, Fr.
Alkali compounds: hydroxides.
acids and alikline are cemicals what might be corrosive and if it is corrosive it can burn through skin and metal and anything.
If you mean 'Alkali (s) , or base, it is the opposite of an acid. And like acids on skin, it can cause and feel like burns - it can actually cause chemical burns. I have had such an experience from hydrochloric acid personally, and it is very painful. So alkalis can cause chemical burns, and cause a burning feeling on exposed skin.