follow @PCDSUKThe clinical chapters provide concise guidance about dermatological conditions and their management. Where there is diagnostic uncertainty refer to the diagnostic tables.
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- Lamellar ichthyosis (Last Updated: 20/11/2015)
- Lamellar nail dystrophy (Last Updated: 02/05/2016)
- Langerhans cell histiocytosis (Last Updated: 10/09/2016)
- Lassueur Graham-Little Piccardi Syndrome (Last Updated: 18/01/2013)
- Late-onset (non-classical) congenital adrenal hyperplasia (Last Updated: 15/02/2013)
- Latex and rubber allergy (Last Updated: 18/01/2013)
- Leg ulcers (and disorders of venous insufficiency) (Last Updated: 17/10/2016)
- Leiomyoma (Last Updated: 10/05/2013)
- Leiomyosarcoma (Last Updated: 15/11/2014)
- Leishmaniasis (Last Updated: 09/11/2015)
- Lentigo (syn. lentigine) (Last Updated: 02/02/2017)
- Lentigo maligna (Last Updated: 06/07/2016)
- Leprosy (Last Updated: 09/11/2015)
- Leser-Trélat sign (Last Updated: 19/08/2016)
- Leucocytoclastic vasculitis (Last Updated: 27/06/2015)
- Leukaemia cutis (Last Updated: 22/08/2013)
- Leukonychia (Last Updated: 02/05/2016)
- Leukoplakia (and other white patches in the mouth) (Last Updated: 19/11/2014)
- Lice (syn. Phthiraptera) (Last Updated: 26/06/2014)
- Lichen aureus (Last Updated: 17/06/2015)
- Lichen myxoedematosus (Last Updated: 01/06/2016)
- Lichen nitidus (Last Updated: 17/03/2016)
- Lichen planopilaris (Last Updated: 18/01/2013)
- Lichen planus (Last Updated: 24/04/2017)
- Lichen planus - follicular lichen planus (Last Updated: 24/11/2016)
- Lichen planus pigmentosus (Last Updated: 05/11/2013)
- Lichen sclerosus (syn. lichen sclerosus et atrophicus) (Last Updated: 29/06/2017)
- Lichen scrofulosorum (Last Updated: 29/10/2015)
- Lichen simplex (syn. circumscribed neurodermatitis) (Last Updated: 13/12/2016)
- Lichen spinulosus (syn. keratosis spinulosa) (Last Updated: 30/12/2015)
- Lichen striatus (Last Updated: 04/04/2016)
- Lichenoid eruption (Last Updated: 14/09/2012)
- Lichenoid keratosis (syn. lichen planus-like keratosis) (Last Updated: 21/11/2014)
- Light microscopy (Last Updated: 19/09/2012)
- Linear and whorled naevoid hypermelanosis (Last Updated: 25/06/2016)
- Linear atrophoderma of Moulin (Last Updated: 25/06/2016)
- Linear IgA disease (syn. chronic bullous disease of childhood; linear IgA bullous dermatosis) (Last Updated: 06/09/2015)
- Lipoatrophy, lipodystrophy, and panatrophy (Last Updated: 02/07/2016)
- Lipodermatosclerosis (Last Updated: 16/01/2015)
- Lipoma (Last Updated: 06/07/2016)
- Lipomatosis (Last Updated: 30/05/2013)
- Liposarcoma (Last Updated: 21/11/2014)
- Liquid nitrogen (Last Updated: 06/07/2016)
- Livedo reticularis (Last Updated: 12/07/2015)
- Livedoid vasculopathy (Last Updated: 27/06/2015)
- Longitudinal melanonychia (Last Updated: 02/05/2016)
- Lupus erythematosus (Last Updated: 07/06/2017)
- Lupus pernio (Last Updated: 11/01/2016)
- Lupus vulgaris (Last Updated: 29/10/2015)
- Lyme disease (and erythema migrans) (Last Updated: 24/04/2017)
- Lymphangioma circumscriptum (Last Updated: 21/11/2014)
- Lymphocytoma cutis (Last Updated: 02/10/2015)
- Lymphoedema (Last Updated: 24/04/2017)
- Lymphogranuloma venerum (Last Updated: 09/11/2015)
- Lymphoma and leukaemia - cutaneous presentations (Last Updated: 28/04/2017)
- Lymphomatoid papulosis (Last Updated: 22/08/2013)