What could cause a bunch of tiny colorless rash-like bumps along the left jawline some which are spreading to cheek?

Potential Causes:

1. Acne vulgaris: Common skin condition that includes tiny, non-inflamed bumps called "whiteheads" or "blackheads".

2. Milia: Small, white bumps that occur when skin flakes are trapped under the skin's surface.

3. Keratosis pilaris: Causes small, rough bumps on the skin due to buildup of keratin, a skin protein.

4. Allergic reaction: A Contact or allergic dermatitis can cause a rash-like reaction when skin touches an allergen.

5. Folliculitis: Infection or inflammation of the hair follicles, may lead to small bumps.

6. Viral infection: Some viral infections, such as herpes zoster can manifest with a rash on the face.

7. Bacterial infection: Bacterial skin infections, like impetigo, may cause small blisters and bumps on the skin.

8. Fungal infection: Fungal infections like tinea faciale (ringworm of the face) can lead to small rash -like bumps.

9. Eczema: A chronic inflammatory skin condition often associated with dry, red and itchy skin. Atopic eczema is the most common type and can present as small, colorless bumps.

10. Contact dermatitis: Occurs when the skin comes into contact with a substance that irritates it or causes an allergic reaction. This can lead to rash, redness and bumps.

If you're experiencing a persistent rash, it's advisable to consult a dermatologist or healthcare provider for proper diagnosis and treatment.