*'''Volatile Fatty Acids (VFAs)''' (acetic, propionic, butyric and valeric acids) are lipid soluble. They readily diffuse into the squamous mucosal cells of the ''stratum spinosum'' causing similar damage to HCl. | *'''Volatile Fatty Acids (VFAs)''' (acetic, propionic, butyric and valeric acids) are lipid soluble. They readily diffuse into the squamous mucosal cells of the ''stratum spinosum'' causing similar damage to HCl. |