What is the diagnosis and recommended treatment for a patient presenting with a red, raised bump on the left side of the neck, resulting from a tick bite that occurred two weeks ago, with mild tenderness but no pain or fever, and has shown some relief with salt water compresses?

Local Tick Bite Reaction: This is the most likely diagnosis given the patient's presentation of a red, raised bump at the site of the tick bite, with mild tenderness but no pain or fever. The fact that the tick was not attached for a long time and was not engorged reduces the likelihood of a more serious tick-borne illness, but a local reaction to the tick's saliva is still possible.

Folliculitis: An infection of the hair follicle, which could be caused by the tick bite or by the patient's use of salt water compresses. The presence of a red, raised bump and mild tenderness is consistent with folliculitis.
Contact Dermatitis: A skin reaction to an irritant, such as the tick's saliva or a substance in the salt water compresses. This could cause a red, raised bump and mild tenderness.
Insect Bite Reaction: While the patient specifically mentions a tick bite, it's possible that the reaction is to another type of insect bite.

Lyme Disease: Although the patient does not have the classic "bull's-eye" rash of Lyme disease, it's still possible that they could develop the disease, especially if the tick was infected. Lyme disease can have serious consequences if left untreated, so it's essential to consider this diagnosis.
Rocky Mountain Spotted Fever: This is another tick-borne illness that can have serious consequences if left untreated. While it's less likely given the patient's lack of fever and other symptoms, it's still important to consider this diagnosis.
Southern Tick-Associated Rash Illness (STARI): This is a tick-borne illness that can cause a rash similar to Lyme disease. While it's less common, it's still important to consider this diagnosis, especially if the patient has been in an area where the disease is common.

Tick-Borne Relapsing Fever: This is a rare disease caused by a tick-borne bacterium. It's characterized by recurring episodes of fever, headache, and muscle pain.
Ehrlichiosis: This is a rare disease caused by a tick-borne bacterium. It can cause fever, headache, and muscle pain, as well as more serious complications if left untreated.
Anaplasmosis: This is a rare disease caused by a tick-borne bacterium. It can cause fever, headache, and muscle pain, as well as more serious complications if left untreated.