Ailments fromi) Abuse of crude mercurial preparations.ii) Stings of insects.ii) Vapour of Arsenic or Copper. iv) Suppressed gonorrhoea and syphilis, Clinical Boils and abscesses, Psoriasis, Herpes, Zona Eczema and eruptions. (Ref. Farrington)Appearance of the skin i) Skin is rough, unhealthy, with profuse, offensive, non-relieving sweat.ii) Constantly moist skin.Note: Persistent dryness of the skin contraindicates Merc. Sol.  iii) Skin is dirty, yellow, rough, flabby. (Ref. Farrington’s Comparative Materia Medica).Nature of skin diseasea) Abscessesi) Due to unhealthy skin, every little injury suppurates. (. Hepar., Graph. Sulph.. Petrol).ii) Suppurative process is slower than Hepariii) Abscesses at the root of teeth, suppurative tonsillitis. (Ref. Farrington) b) Ulcersi) Spreads superficially, feels raw, excoriated, lardaceous surface.ii) Ulcers are of irregular shape with underlined.iii) The margins are everted like raw meat and the base is covered with caseous coat, having a dirty unhealthy look.  iv) Ulcers bleeds easily when touched with tensive pain, v) Rapidly decomposing ulcers on legs.vi) Cold abscess: slow to suppurate. C) Eruptionsi)Humid, fortid eruptions, thick yellow charge of yellow crusts from scalp. ii) Violent and voluptuous itching over whole body, principally in the eveningor at night. (Ref. Farrington’s Comparative Materia Medica).  iii) Scratching causes bleeding. (Farrington)D) Modalities:Agg at night in wet damp weather. Agg. by perspiration. Agg. in warm room, bed. Amel, in the morning, from scratching.