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Why does acid reacts with skin??

I can understand the acid would react with blood as it is alkaline in nature. But when i googled pH of skin, its around 4-5, "it is estimated that the 'natural' skin surface pH is on average 4.7, i.e. below 5"(Reference) The thing that i could guess is that only H+ are the ions that would react with our skin since only H+ are common in every acid. But since our skin is also acidic how will an acid react with another acidic material

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closed as too broad by Jan, bon, Todd Minehardt, Klaus-Dieter Warzecha, Wildcat Oct 1 '15 at 15:30

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ The shortest answer I could give is that not every molecule in a skin cell is acidic. Many biomolecules are also prone to hydrolysis under strongly acidic conditions $\endgroup$ – orthocresol♦ Oct 1 '15 at 8:23
  • $\begingroup$ but what about dil. sulfuric acid or dil. acetic acid. acetic acid is even less acidic but there is still burning sensation with a bit if conc. acetic acid $\endgroup$ – Chinmay Chandak Oct 1 '15 at 8:46
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    $\begingroup$ 1 molar (that is: dilute) sulphuric acid still has a pH of approximately zero, so for sure it will react somehow. Acids can react with much more than ‘just’ alkaline solutions. $\endgroup$ – Jan Oct 1 '15 at 12:23
  • $\begingroup$ isn't the question narrow enough to answer??? it is as simple that "why does acid reacts with our skin to give burns?" :( $\endgroup$ – Chinmay Chandak Oct 1 '15 at 16:28
  • $\begingroup$ Acids first participate proteins in the skin to form a barrier. Alkali compounds tend to digest tissue and penetrate deeper into the skin/body. $\endgroup$ – MaxW Oct 23 '15 at 7:10