How to conceal the monster of all spots

I woke up this morning with a gigantic spot in the middle of my forehead. I now know get where the ancient Greeks got Cyclops from; they obviously spotted a poor unfortunate who was having as bad a face day as me.

It's one of those bad, bad boys that has been festering away under the skin for about a week; he's a shy one, but now he's finally come to say hello. And seriously, you can't miss him; he's more bulbous boil than niggly pimple.

Concealing it took longer than putting the rest of my face on, such is its girth. I should be grateful that I don't have any heavy duty, polyfilla-esque concealer left - it reminds me that my skin has been behaving itself somewhat for the past couple of months - but I only have Touche Eclat left, and you and I both know that is going to do nothing for a whopper of a zit.

When you have a monstrous deformity such as I have (no pictures! Sorry, it's hideous), you need to treat it differently to the rest of your face, because it is different. It's an alien that doesn't belong there. I consulted with our resident beauty guru Aisling, who advised these steps for when covering up a face-hill.

• Prep the spot with an eye shadow primer, like Maybelline 24 hour tattoo eye shadow primer, in the closest shade to your skin.
• Apply a concealer that goes on with a cream texture but dries matte. The matte part is important; spots tend to be shiny and they reject product (those b*stards would ask for a police siren at the tip if they could), so the product you use should always dry matte. Aisling recommends MAC Select Cover-Up.
• Dust with a little powder to set that guy and put him back into the background where he belongs.

It's easy when you know how, and when you have the right products. I used to use my Catrice Camouflage Cream on every blemish, including those slippery cystic spots, and couldn't understand why it kept on sliding off the thing I needed covering most. Now I know. So the steps are: prime, cover with a matte-finish concealer, and set.

Do you have a fool-proof method for covering other types of blemishes?