I'm sorry to hear that you're experiencing persistent itching, dark rashes, and swelling despite taking Levocetirizine 10 mg. It can be frustrating when symptoms don't improve with initial treatment.

Here are some important points and suggestions:

• Symptom Pattern: The rashes and swelling that appear and disappear within a couple of hours could suggest a type of allergic reaction or urticaria (hives), but the presence of dark rashes is unusual and warrants further evaluation.
• Medication Response: Since Levocetirizine, an antihistamine, has not helped, it may indicate that the underlying cause is not fully addressed or that a different treatment approach is needed.
• Next Steps:
  • Return to your dermatologist or skin specialist for a thorough reassessment.
  • They may consider additional tests such as allergy testing, blood work, or skin biopsy to better understand the cause.
  • Alternative treatments might include different antihistamines, corticosteroids, or other medications depending on the diagnosis.
  • Avoid known irritants or allergens and keep the affected area clean and moisturized.
• Urgency: If you experience worsening swelling, difficulty breathing, or other systemic symptoms, seek emergency medical care immediately.

Please consult your dermatologist again to discuss these symptoms and explore further diagnostic and treatment options tailored to your condition.To narrow down potential causes, we will need some more information.I understand you're dealing with itching, rashes, and swelling that come and go, and that Levocetirizine hasn't provided relief. To better understand your situation and provide relevant advice, could you please share your age and gender?