<prompt> Scab or crust of abrasion appears brown in:12-24 h2-3 days4-5 days5-7 days  <response>: Fresh Raw Reddish 2 - 24 hours Reddish scab lymph, blood dries up 2 - 3 days Reddish brown scab 4 - 5 days Brown scab 6- 7 days Scab falls off. Remember the mnemonic RRRBBB 