Factitious disorder or self-inflicted injury: This is a condition where a person intentionally inflicts injuries upon themselves, which could include inserting needles into their skin. The presence of needles in visible areas such as the face and leg might suggest a cry for help or an attempt to manipulate others.

Accidental injury: It's possible that the needles were accidentally embedded in the skin, perhaps during a medical procedure or an accident involving a needle.
Infection or abscess: Needles could be inserted into the skin in an attempt to drain an abscess or relieve pressure from an infection, although this is not a recommended or safe practice.
Substance abuse: Intravenous drug users might accidentally or intentionally embed needles in their skin, especially if they are experiencing withdrawal symptoms or are under the influence.

Tetanus infection: If the needles were contaminated, there's a risk of tetanus infection, which can be deadly if not treated promptly. Tetanus shots or booster shots might be necessary.
Blood-borne pathogens: The risk of contracting blood-borne diseases like HIV or hepatitis cannot be overlooked, especially if the needles were shared or used previously.

Foreign body granuloma: A rare condition where the body reacts to a foreign object (like a needle) by forming a granuloma, which is a cluster of immune cells attempting to wall off the foreign material.
Munchausen syndrome by proxy: Although rare, it's possible that someone else, often a caregiver, is inflicting the injuries, including inserting needles, as a form of abuse to garner sympathy or attention for themselves.