Hi thanks for contacting HCM.. You have mild allergic bronchitis with no significant complication... Here whenever allergic problem like rhinitis , you can take antihistaminic drug to relieve congestion.... Try to avoid contributory allergens like dust, pollution, smoke , pollen etc .. Before precipitating whether you can take montelukast tablet .... Steam inhalation useful.... For allergy control Take turmeric powder with hot milk .... This time black spot can be from bleed which can occur in bronchitis... If same black spot continues then consult physician for respiratory examination and chest x ray.... Take care