"The top and front of the skull of the abelisaurid theropod, Majungasaurus crenatissimus, matches osteological and histological criteria for dermal armour, and this is good reason to restore this species with thick, collagen-reinforced skin over its snout and braincase region (Hieronymus 2009). Adjacent skull areas - the sides of the jaws, the roof of the mouth, the orbital and cheek regions - also show hints of a gnarly skin covering, these being marked with a bone texture characterised by deep pits and grooves. Among modern animals, this seems best correlated with thick, highly keratinised skin, such as cornified pads or beaks (Heironymus 2009; Hieronymus et al. 2009). When considered with the correlate for dermal armour, these textures suggest the face and oral cavity of Majungasaurus was covered in deep, reinforced skin tissue, and we have to wonder how much of the underlying skull structure was obvious in life".
From Witton (2017).
It speaks for itself