Differential Diagnosis
- Single most likely diagnosis
- Urticaria (hives): This is the most likely diagnosis given the random and unpredictable nature of the symptoms, which can appear anywhere on the body, including the legs, arms, chest, and stomach area. Urticaria is a common condition characterized by itchy, raised welts that can occur due to allergic reactions, infections, or other factors.
- Other Likely diagnoses
- Eczema (atopic dermatitis): This condition can cause itchy, inflamed skin that can appear anywhere on the body, including the areas mentioned. It's a chronic condition that can be triggered by various factors, including allergies and environmental factors.
- Contact dermatitis: This is a type of skin inflammation that occurs when the skin comes into contact with an irritant or allergen, causing redness, itching, and blistering. It can appear on any part of the body, including the legs, arms, chest, and stomach area.
- Insect bites or stings: These can cause itchy, raised lesions that can appear anywhere on the body, depending on the location of the bite or sting.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Anaphylaxis: Although rare, anaphylaxis is a life-threatening allergic reaction that can cause widespread skin symptoms, including hives, itching, and swelling, as well as respiratory and cardiovascular symptoms. It requires immediate medical attention.
- Stevens-Johnson syndrome: This is a rare but serious condition that can cause widespread skin lesions, blisters, and peeling, often accompanied by fever, sore throat, and conjunctivitis. It can be triggered by medications, infections, or other factors.
- Rare diagnoses
- Erythema multiforme: This is a rare skin condition characterized by target-shaped lesions that can appear anywhere on the body, often accompanied by fever, sore throat, and other symptoms. It can be triggered by infections, medications, or other factors.
- Cutaneous mastocytosis: This is a rare condition characterized by an accumulation of mast cells in the skin, leading to itchy, raised lesions that can appear anywhere on the body. It can be triggered by various factors, including allergies and genetic mutations.