Differential Diagnosis for Bruised Rash with Bite Marks and Itchy
- Single most likely diagnosis
- Insect bites (e.g., bed bugs, mosquitoes, fleas): This is the most likely diagnosis due to the presence of bite marks and a bruised, itchy rash. The symptoms are consistent with an allergic reaction to insect bites.
- Other Likely diagnoses
- Allergic contact dermatitis: This condition could cause a bruised, itchy rash, especially if the patient has come into contact with an allergen or irritant.
- Eczema (atopic dermatitis): Eczema can cause itchy, inflamed skin that may appear bruised, and can be exacerbated by scratching or skin irritation.
- Scabies: Scabies is a parasitic infection that causes intense itching and a rash, and can be spread through skin-to-skin contact.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Meningococcemia: This is a life-threatening infection that can cause a rash, and although it is unlikely, it is crucial to consider due to its high mortality rate if left untreated.
- Rocky Mountain spotted fever: This tick-borne illness can cause a rash, fever, and headache, and can be fatal if not treated promptly.
- Lyme disease: Lyme disease is a tick-borne illness that can cause a rash, fever, and other symptoms, and can lead to serious complications if left untreated.
- Rare diagnoses
- Leukocytoclastic vasculitis: This is a rare condition that causes inflammation of the blood vessels and can result in a bruised, itchy rash.
- Erythema multiforme: This is a rare skin condition that can cause a bruised, itchy rash, and is often triggered by an infection or medication.
- Cutaneous lymphoma: This is a rare type of cancer that can cause a bruised, itchy rash, and is often associated with other symptoms such as fever and weight loss.