Rhus Venenata is a homeopathic remedy for itching, skin eruptions. The skin symptoms of this species of Rhus are most severe. Heavy, frontal headache; worse, walking or stooping. Tongue is red at tip, fissured in middle. Worse before stools; damp days; hot weather; rest; mental exertion; motion aggravates pain in elbow; walking aggravates frontal headache; morning after waking; touch and pressure. Better moderate exercise or open air; hot bath; gently rubbing and scratching. Source: Boericke Materia Medica
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