These lumps/nodules are what they call a fibro rash.
There are a number of different types of skin-related symptoms that occur in fibromyalgia. Many of them are present alongside one another or become chronic problems. Skin-related fibromyalgia symptoms include the following:

Dry Skin – Many people with fibromyalgia are plagued with dry, cracked skin. Dry flaky skin can appear anywhere on the body, but it particularly affects the hands and fingers. Sometimes this dry skin will begin to peel and cause pain and discomfort.
Itchy Skin – Itchy skin is usually one of the most common skin complaints among those with fibromyalgia. Of course dry skin and rashes can make your skin itch but most often, with fibromyalgia, it occurs without any obvious cause. It is known as a sensory itch and has to do with how our body interprets pain signals.
Rashes – People with fibromyalgia often complain of skin rashes. The typical rash associated with fibromyalgia is red and can be flat or raised and bumpy. In some cases, there is also itchiness. Scratching or sun exposure can make the rash burn.
Mottled Skin – The skin of fibromyalgia sufferers often begins to change color, appearance, or tone. Mottled skin is due to blood vessel changes in the skin that cause a blotchy appearance. These blotches can appear anywhere on the body, particularly on the inside of the forearms and thighs.
Bruising – Many of us with fibromyalgia experience unexplained bruising. I often end up with bruises on my arms, legs and other areas of the body and don’t remember bumping into anything.
Painful Skin (Allodynia) – Allodynia is a fairly rare type of pain in which your skin hurts. Allodynia is believed to be a hypersensitive reaction to temperature and stimuli that wouldn’t normally cause pain. Even a light touch to the skin can be unbearable.
If you struggle with intense itching, red rashes or see a huge bruise that you have no memory of creating, you are not alone. These are not symptoms that you would naturally link to fibromyalgia, but they are connected.

@A MyFibroTeam Member

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A MyFibro...

I noticed tiny lumps years ago on the under side of my forearms, they have now vanished but last week I've noticed one has returned on the front of my upper arm, I can pick it up it's hard and painful .

I've had one removed on my forearm d/t pain and the fact it's the part where my arm lays on/against the table. I have multiple ones that look like bruises because they're entangled with vessels. Those are painful. ALL of my lypomas are scattered in size, texture, flexibility, and depth. At this time I have one on my right mid finger; the rest encompass my arms right down to my wrists(approx 8); about 6 throughout my back; 1-3 around/on rib cage; and approx 50 around lower back down around hips, thighs down to my knees. We are thinking there may be one or so in anbdomen, that may be causing pain and bowel issues.
I'm always finding new ones, and ones that had once disappeared, resurfaced.
Oh..as for removal, it's a catch22. I can leave them, and only remove the painful ones, yes. They will return! And, d/t my skintone, I would be left with permanent dark brown/purplish scars. I wouldn't be able to walk a beach in a bathing suit as it would literally looked like I was cut up.. So I choose to leave them.

I also have several of the tumors. Some I had removed. Alot of pain.

These lumps/nodules are what they call a fibro rash.
There are a number of different types of skin-related symptoms that occur in fibromyalgia. Many of them are present alongside one another or become chronic problems. Skin-related fibromyalgia symptoms include the following:

Dry Skin – Many people with fibromyalgia are plagued with dry, cracked skin. Dry flaky skin can appear anywhere on the body, but it particularly affects the hands and fingers. Sometimes this dry skin will begin to peel and cause pain and discomfort.
Itchy Skin – Itchy skin is usually one of the most common skin complaints among those with fibromyalgia. Of course dry skin and rashes can make your skin itch but most often, with fibromyalgia, it occurs without any obvious cause. It is known as a sensory itch and has to do with how our body interprets pain signals.
Rashes – People with fibromyalgia often complain of skin rashes. The typical rash associated with fibromyalgia is red and can be flat or raised and bumpy. In some cases, there is also itchiness. Scratching or sun exposure can make the rash burn.
Mottled Skin – The skin of fibromyalgia sufferers often begins to change color, appearance, or tone. Mottled skin is due to blood vessel changes in the skin that cause a blotchy appearance. These blotches can appear anywhere on the body, particularly on the inside of the forearms and thighs.
Bruising – Many of us with fibromyalgia experience unexplained bruising. I often end up with bruises on my arms, legs and other areas of the body and don’t remember bumping into anything.
Painful Skin (Allodynia) – Allodynia is a fairly rare type of pain in which your skin hurts. Allodynia is believed to be a hypersensitive reaction to temperature and stimuli that wouldn’t normally cause pain. Even a light touch to the skin can be unbearable.
If you struggle with intense itching, red rashes or see a huge bruise that you have no memory of creating, you are not alone. These are not symptoms that you would naturally link to fibromyalgia, but they are connected.

@LifelsGood