Unfortunately, the Mole struggled to burrow itself and eventually got just beneath the surface, which was a surprise ... into why Martian soil is so "crusty." According to their findings ...

On 26, 2018, NASA’s Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport (InSight) mission landed ...

A lump on the skin may: Be firm and pink Have a hard, crusty surface Bleed easily Be tender to touch Develop into an ulcer There's a very small risk of squamous cell carcinoma spreading to other ...