otitis externa =inflm of EAC.

acute2 types:

infective -

• bacterial -localised acute furuncle, diffuse, malignant/necrotising.
• fungal =otomycosis.
• viral - herpes zoster oticus, otitis externa haemorrhagica.

reactive -

• eczema
• seborrhoea
• neurodermatitis

localised acute oitis externa =FURUNCLE [1/(many)]

• staph inf of hair follicle[cartilagenous part]
• severe pain,tender -jaw,pinna movts.
• at post mestal wall -mastoid edema,oblit retro auricular groove,(enlarged preauricular Lnodes).

Rx:

• early stage -sys antibiotics,analgesics,local heat, splinttage -ear pack[10% ichthammol(antiseptic)glycerine(hygroscopic)]
• abscess -incise+drain.
• recurrent -treat DM,staph inf of skin/nasal vestibuli.

diffuse otitis externa + [pinna,TM]: